<template>
	<u-popup closeable :maskCloseAble="maskCloseAble" mode="bottom" :popup="false" v-model="value" length="auto"
		:safeAreaInsetBottom="safeAreaInsetBottom" @close="close" :z-index="uZIndex" :border-radius="borderRadius"
		:closeable="closeable">
		<view class="u-calendar">
			<view class="u-calendar__header">
				<view class="u-calendar__header__text" v-if="!$slots['tooltip']">
					{{ toolTip }}
				</view>
				<slot v-else name="tooltip" />
			</view>
			<view class="u-calendar__action u-flex u-row-center">
				<view class="u-calendar__action__icon">
					<u-icon v-if="changeYear" name="arrow-left-double" :color="yearArrowColor"
						@click="changeYearHandler(0)"></u-icon>
				</view>
				<view class="u-calendar__action__icon">
					<u-icon v-if="changeMonth" name="arrow-left" :color="monthArrowColor" @click="changeMonthHandler(0)"></u-icon>
				</view>
				<view class="u-calendar__action__text">{{ showTitle }}</view>
				<view class="u-calendar__action__icon">
					<u-icon v-if="changeMonth" name="arrow-right" :color="monthArrowColor" @click="changeMonthHandler(1)"></u-icon>
				</view>
				<view class="u-calendar__action__icon">
					<u-icon v-if="changeYear" name="arrow-right-double" :color="yearArrowColor"
						@click="changeYearHandler(1)"></u-icon>
				</view>
			</view>
			<view class="u-calendar__week-day">
				<view class="u-calendar__week-day__text" v-for="(item, index) in weekDayZh" :key="index">{{ item }}</view>
			</view>
			<view class="u-calendar__content">
				<!-- 前置空白部分 -->
				<block v-for="(item, index) in weekdayArr" :key="index">
					<view class="u-calendar__content__item"></view>
				</block>
				<view class="u-calendar__content__item" :class="{
					'u-hover-class': openDisAbled(year, month, index + 1),
					'u-calendar__content--start-date': startDate == `${year}-${month}-${index + 1})`,
					'u-calendar__content--end-date': endDate == `${year}-${month}-${index + 1}`
				}" :style="{ backgroundColor: getColor(index, 1) }" v-for="(item, index) in daysArr" :key="index"
					@tap="dateClick(index)">
					<view class="u-calendar__content__item__inner" :style="{ color: getColor(index, 2) }">
						<view>{{ index + 1 }}</view>
					</view>
				</view>
				<view class="u-calendar__content__bg-month">{{ month }}</view>
			</view>
			<view class="u-calendar__bottom">
				<view class="u-calendar__bottom__choose">
					<text>{{ startDate }}</text>
					<text v-if="endDate">至{{ endDate }}</text>
				</view>
				<view class="u-calendar__bottom__btn">
					<u-button :type="btnType" shape="circle" size="default" @click="btnFix(false)">确定</u-button>
				</view>
			</view>
		</view>
	</u-popup>
</template>
<script>

export default {
	name: 'u-calendar',
	props: {
		safeAreaInsetBottom: {
			type: Boolean,
			default: false
		},
		// 是否允许通过点击遮罩关闭Picker
		maskCloseAble: {
			type: Boolean,
			default: true
		},
		// 通过双向绑定控制组件的弹出与收起
		value: {
			type: Boolean,
			default: false
		},
		// 弹出的z-index值
		zIndex: {
			type: [String, Number],
			default: 0
		},
		// 是否允许切换年份
		changeYear: {
			type: Boolean,
			default: true
		},
		// 是否允许切换月份
		changeMonth: {
			type: Boolean,
			default: true
		},
		// 可切换的最大年份
		maxYear: {
			type: [Number, String],
			default: 2050
		},
		// 可切换的最小年份
		minYear: {
			type: [Number, String],
			default: 1950
		},
		// 最小可选日期(不在范围内日期禁用不可选)
		minDate: {
			type: [Number, String],
			default: '1950-01-01'
		},
		/**
		 * 最大可选日期
		 * 默认最大值为今天，之后的日期不可选
		 * 2030-12-31
		 * */
		maxDate: {
			type: [Number, String],
			default: ''
		},
		// 弹窗顶部左右两边的圆角值
		borderRadius: {
			type: [String, Number],
			default: 20
		},
		// 月份切换按钮箭头颜色
		monthArrowColor: {
			type: String,
			default: '#606266'
		},
		// 年份切换按钮箭头颜色
		yearArrowColor: {
			type: String,
			default: '#909399'
		},
		// 默认日期字体颜色
		color: {
			type: String,
			default: '#303133'
		},
		// 选中|起始结束日期背景色
		activeBgColor: {
			type: String,
			default: '#2979ff'
		},
		// 选中|起始结束日期字体颜色
		activeColor: {
			type: String,
			default: '#ffffff'
		},
		// 范围内日期背景色
		rangeBgColor: {
			type: String,
			default: 'rgba(41,121,255,0.13)'
		},
		// 范围内日期字体颜色
		rangeColor: {
			type: String,
			default: '#2979ff'
		},
		//按钮样式类型
		btnType: {
			type: String,
			default: 'primary'
		},
		// 当前选中日期带选中效果
		isActiveCurrent: {
			type: Boolean,
			default: true
		},
		// 切换年月是否触发事件 mode=date时生效
		isChange: {
			type: Boolean,
			default: false
		},
		// 是否显示右上角的关闭图标
		closeable: {
			type: Boolean,
			default: true
		},
		// 顶部的提示文字
		toolTip: {
			type: String,
			default: '选择日期'
		},
		initDateParams:{
			type : Object,
			default : {}
		}
	},
	data () {
		return {
			mode: 'date',
			// 星期几,值为1-7
			weekday: 1,
			weekdayArr: [],
			// 当前月有多少天
			days: 0,
			daysArr: [],
			showTitle: '',
			year: 2020,
			month: 0,
			day: 0,
			startYear: 0,
			startMonth: 0,
			startDay: 0,
			endYear: 0,
			endMonth: 0,
			endDay: 0,
			today: '',
			startDate: '',
			endDate: '',
			min: null,
			max: null,
			weekDayZh: ['一', '二', '三', '四', '五', '六','日'],
			yearWeek:1
		};
	},
	computed: {
		dataChange () {
			return `${this.mode}-${this.minDate}-${this.maxDate}`;
		},
		uZIndex () {
			// 如果用户有传递z-index值，优先使用
			return this.zIndex ? this.zIndex : this.$u.zIndex.popup;
		}
	},
	watch: {
		dataChange (val) {
			this.init()
		}
	},
	created () {
		this.init()
		this.getYearWeek()
	},
	methods: {
		getColor (index, type) {
			let color = type == 1 ? '' : this.color;
			let day = index + 1
			let date = `${this.year}-${this.month}-${day}`
			let timestamp = new Date(date.replace(/\-/g, '/')).getTime();
			let start = this.startDate.replace(/\-/g, '/')
			let end = this.endDate.replace(/\-/g, '/')
			let startTime = new Date(start).getTime()
			let endTime = new Date(end).getTime()
		  if (this.endDate && timestamp > startTime && timestamp < endTime) {
				color = type == 1 ? this.rangeBgColor : this.rangeColor;
			}else if(timestamp == startTime || timestamp == endTime){
				color = type == 1 ? this.activeBgColor : this.activeColor;
			}
			return color;
		},
		init () {
			let now;
			if(this.initDateParams && this.initDateParams.year && this.initDateParams.month && this.initDateParams.day){
				now = new Date(this.initDateParams.year,this.initDateParams.month,this.initDateParams.day);
			}else{
				now = new Date()
			}
			let minDate = new Date(this.minDate);
			let maxDate = new Date(this.maxDate);
			if (now < minDate) now = minDate;
			if (now > maxDate) now = maxDate;
			this.year = now.getFullYear();
			this.month = now.getMonth() + 1;
			this.day = now.getDate();
			this.today = `${now.getFullYear()}-${now.getMonth() + 1}-${now.getDate()}`;
			this.min = this.initDate(this.minDate);
			this.max = this.initDate(this.maxDate || this.today);
			this.startDate = "";
			// this.startYear = 0;
			// this.startMonth = 0;
			this.startDay = 0;
			// this.endYear = 0;
			// this.endMonth = 0;
			this.endDay = 0;
			this.endDate = "";
			this.changeData();
		},
		//日期处理
		initDate (date) {
			let fdate = date.split('-');
			return {
				year: Number(fdate[0] || 1920),
				month: Number(fdate[1] || 1),
				day: Number(fdate[2] || 1)
			}
		},
		openDisAbled: function (year, month, day) {
			let bool = true;
			let date = `${year}/${month}/${day}`;
			// let today = this.today.replace(/\-/g, '/');
			let min = `${this.min.year}/${this.min.month}/${this.min.day}`;
			let max = `${this.max.year}/${this.max.month}/${this.max.day}`;
			let timestamp = new Date(date).getTime();
			if (timestamp >= new Date(min).getTime() && timestamp <= new Date(max).getTime()) {
				bool = false;
			}
			return bool;
		},
		//更改 UI- 从星期一开始或者星期日开始
		generateArray: function (start, end) {
			return Array.from(new Array(end+1).keys()).slice(start);
		},
		formatNum: function (num) {
			return num < 10 ? '0' + num : num + '';
		},
		//一个月有多少天
		getMonthDay (year, month) {
			let days = new Date(year, month, 0).getDate();
			return days;
		},
		getWeekday (year, month) {
			let date = new Date(`${year}/${month}/01 00:00:00`);
			return date.getDay();
		},
		checkRange (year) {
			let overstep = false;
			if (year < this.minYear || year > this.maxYear) {
				uni.showToast({
					title: "日期超出范围啦~",
					icon: 'none'
				})
				overstep = true;
			}
			return overstep;
		},
		changeMonthHandler (isAdd) {
			if (isAdd) {
				let month = this.month + 1;
				let year = month > 12 ? this.year + 1 : this.year;
				if (!this.checkRange(year)) {
					this.month = month > 12 ? 1 : month;
					this.year = year;
					this.changeData();
				}

			} else {
				let month = this.month - 1;
				let year = month < 1 ? this.year - 1 : this.year;
				if (!this.checkRange(year)) {
					this.month = month < 1 ? 12 : month;
					this.year = year;
					this.changeData();
				}
			}
		},
		changeYearHandler (isAdd) {
			let year = isAdd ? this.year + 1 : this.year - 1;
			if (!this.checkRange(year)) {
				this.year = year;
				this.changeData();
			}
		},
		changeData () {
			this.days = this.getMonthDay(this.year, this.month);
			this.daysArr = this.generateArray(1, this.days)
			this.weekday = this.getWeekday(this.year, this.month);
			this.weekdayArr = this.generateArray(2, this.weekday)
			this.showTitle = `${this.year}年${this.month}月`;
			if (this.isChange && this.mode == 'date') {
				this.btnFix(true);
			}
		},
		dateClick: function (day) {
			day += 1;
			if (!this.openDisAbled(this.year, this.month, day)) {
				this.day = day;
				this.getYearWeek()
			}
		},
		close () {
			// 修改通过v-model绑定的父组件变量的值为false，从而隐藏日历弹窗
			this.$emit('input', false);
		},
		getWeekText (date) {
			date = new Date(`${date.replace(/\-/g, '/')} 00:00:00`);
			let week = date.getDay();
			return '星期' + ['一', '二', '三', '四', '五', '六','日'][week];
		},
		btnFix (show) {
			if (!show) {
				this.close();
			}
			if (!this.startDate || !this.endDate) return;
			this.$emit('change', {
				year: this.year,
				yearWeek:this.yearWeek
			});
		},
		getYearWeek(){
			var cur = new Date(`${this.year}/${this.month}/${this.day}`);
			var curTime = cur.getTime();
			var curDay = cur.getDay();
			var oneDayTime = 24 * 60 * 60 * 1000;
			//显示周一
			var MondayTime = curTime - (curDay-1) * oneDayTime;
			//显示周日
			var SundayTime = curTime + (7 - curDay) * oneDayTime;
			//初始化日期时间
			var monday = new Date(MondayTime);
			var sunday = new Date(SundayTime);

			this.startDate = `${monday.getFullYear()}-${monday.getMonth()+1}-${monday.getDate()}`
			this.endDate = `${sunday.getFullYear()}-${sunday.getMonth()+1}-${sunday.getDate()}`
			this.startDay = monday.getDate();
			this.endDay = sunday.getDate()

			//计算当前是本年第几周
			const dateFirst = new Date(this.year, 0, 1)
			const dataNumber = Math.round((cur.valueOf() - dateFirst.valueOf()) / oneDayTime)
			this.yearWeek = Math.ceil((dataNumber + dateFirst.getDay()) / 7)
		}
	}
};
</script>

<style scoped lang="scss">
// 定义混入指令，用于在非nvue环境下的flex定义，因为nvue没有display属性，会报错
@mixin vue-flex($direction: row) {
	/* #ifndef APP-NVUE */
	display: flex;
	flex-direction: $direction;
	/* #endif */
}

.u-calendar {
	color: $u-content-color;

	&__header {
		width: 100%;
		box-sizing: border-box;
		font-size: 30rpx;
		background-color: #fff;
		color: $u-main-color;

		&__text {
			margin-top: 30rpx;
			padding: 0 60rpx;
			@include vue-flex;
			justify-content: center;
			align-items: center;
		}
	}

	&__action {
		padding: 40rpx 0 40rpx 0;

		&__icon {
			margin: 0 16rpx;
		}

		&__text {
			padding: 0 16rpx;
			color: $u-main-color;
			font-size: 32rpx;
			line-height: 32rpx;
			font-weight: bold;
		}
	}

	&__week-day {
		@include vue-flex;
		align-items: center;
		justify-content: center;
		padding: 6px 0;
		overflow: hidden;

		&__text {
			flex: 1;
			text-align: center;
		}
	}

	&__content {
		width: 100%;
		@include vue-flex;
		flex-wrap: wrap;
		padding: 6px 0;
		box-sizing: border-box;
		background-color: #fff;
		position: relative;

		&--end-date {
			border-top-right-radius: 8rpx;
			border-bottom-right-radius: 8rpx;
		}

		&--start-date {
			border-top-left-radius: 8rpx;
			border-bottom-left-radius: 8rpx;
		}

		&__item {
			width: 14.2857%;
			@include vue-flex;
			align-items: center;
			justify-content: center;
			padding: 6px 0;
			overflow: hidden;
			position: relative;
			z-index: 2;

			&__inner {
				height: 84rpx;
				@include vue-flex;
				align-items: center;
				justify-content: center;
				flex-direction: column;
				font-size: 32rpx;
				position: relative;
				border-radius: 50%;

				&__desc {
					width: 100%;
					font-size: 24rpx;
					line-height: 24rpx;
					transform: scale(0.75);
					transform-origin: center center;
					position: absolute;
					left: 0;
					text-align: center;
					bottom: 2rpx;
				}
			}

			&__tips {
				width: 100%;
				font-size: 24rpx;
				line-height: 24rpx;
				position: absolute;
				left: 0;
				transform: scale(0.8);
				transform-origin: center center;
				text-align: center;
				bottom: 8rpx;
				z-index: 2;
			}
		}

		&__bg-month {
			position: absolute;
			font-size: 130px;
			line-height: 130px;
			left: 50%;
			top: 50%;
			transform: translate(-50%, -50%);
			color: #e4e7ed;
			z-index: 1;
		}
	}

	&__bottom {
		width: 100%;
		@include vue-flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		background-color: #fff;
		padding: 0 40rpx 30rpx;
		box-sizing: border-box;
		font-size: 24rpx;
		color: $u-tips-color;

		&__choose {
			height: 50rpx;
		}

		&__btn {
			width: 100%;
		}
	}
}
</style>
